CN102103237B - Hermetic seal between packaging part and optical fiber - Google Patents
Hermetic seal between packaging part and optical fiber Download PDFInfo
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- CN102103237B CN102103237B CN201010586977.8A CN201010586977A CN102103237B CN 102103237 B CN102103237 B CN 102103237B CN 201010586977 A CN201010586977 A CN 201010586977A CN 102103237 B CN102103237 B CN 102103237B
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- Prior art keywords
- optical fiber
- lasso
- cte
- encapsulation
- compression sleeve
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4248—Feed-through connections for the hermetical passage of fibres through a package wall
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Abstract
The present invention relates to a kind of hermetic seal be arranged on by optical fiber in optical module packaging part, comprise an encapsulation lasso being attached on packaging part in gas-tight seal mode or becoming one with packaging part, one is carried out the optical fiber ferrule of gas-tight seal around optical fiber, and one is carried out the compression sleeve of gas-tight seal around encapsulation lasso.This compression sleeve is hermetically sealed to optical fiber ferrule, or is integrated with optical fiber ferrule, and wherein compression sleeve thermal expansivity (CTE) higher than encapsulation lasso CTE, make compression sleeve and encapsulation lasso between seam be in compressive stress under.
Description
Technical field
Generally speaking, the present invention relates to optical fiber, more specifically, relate to the hermetic seal (hermetic feedthrough) of optical fiber and optical module packaging part.
Background technology
Wavelength-selective switches (WSS) is used to carry out dynamic attenuation, blocking-up, switching and route independently to the light of various wavelength.Because WSS is used to the management of real-time optical network, they must be highly reliable, wherein comprises the high tolerance to physical shock and environmental baseline.
The N port module that WWS is made up of with the gas-tight seal block controlling electronic circuit optical element; Optical fiber is thereon soldered.The gas-tight seal of optical fiber and packaging part is a critical aspects of WSS module level Hermetic Package technology.But the tension at solder joint place often can cause solder crack, damages sealing thus, thus be unfavorable for realizing meeting industrial requirements.
Usually, optical fiber be soldered to there is high thermal expansion coefficient (CTE) optical fiber ferrule in, to realize the pressure seal between solder and optical fiber.Be have low CTE to the major requirement of encapsulating material, reason is that (a) may be rigidly attached on packaging part due to optics, therefore needs the opto-mechanical stability considering encapsulating material; (b) with may mate as the calorifics of the ceramic/glass material of any low CTE of the ingredient of packaging part.Packaging part and the conflicting CTE of optical fiber ferrule require to cause challenge to the hermetically sealed reliability between optical fiber and optical fiber ferrule; Namely the large tension existed in sealing can cause solder joint too early wear-out failure to occur under thermal cycle conditions.
Summary of the invention
An object of the present invention is the negative effect eliminating or reduce at least to greatest extent tension between optical fiber ferrule and packaging part, and a kind of hermetic seal of optical fiber and packaging part is provided, and form the method for this hermetic seal.
Correspondingly, the present invention relates to a kind of hermetic seal be arranged on by optical fiber in optical module packaging part, comprise: the encapsulation lasso being attached on packaging part in gas-tight seal mode or becoming one with packaging part, carry out the optical fiber ferrule of gas-tight seal around optical fiber, and carry out the compression sleeve of gas-tight seal around encapsulation lasso; Wherein compression sleeve is hermetically sealed to optical fiber ferrule, or become one with optical fiber ferrule, and wherein compression sleeve thermal expansivity (CTE) (a) higher than encapsulation lasso CTE, make compression sleeve and encapsulation lasso between seam be in compressive stress under; And the CTE substantial match of (b) and optical fiber ferrule, to reduce the stress of compression sleeve and optical fiber ferrule interface to greatest extent.
Another aspect of the present invention relates to provides a kind of method making optical fiber form hermetic seal in optical module packaging part, and described method comprises the optical fiber providing and install and be welded in optical fiber tube; By brazing or soldering mode, optical fiber tube is welded in liner; Liner is inserted in encapsulation lasso; The outside surface of compression sleeve around encapsulation lasso is installed simultaneously; Again the integral element brazing of formed compression sleeve and liner or soldering mode are welded to and encapsulate on lasso.
Another aspect of the present invention provides a kind of method making optical fiber form hermetic seal in optical module packaging part.Described method comprises the optical fiber providing and install and be welded in optical fiber ferrule; Optical fiber ferrule is welded in a part for compression sleeve; Again another part of compression sleeve is welded around encapsulation lasso.
Accompanying drawing explanation
The present invention is described in more detail with reference to the accompanying drawings, wherein:
Figure 1A is the xsect of a kind of conventional feedthrough seal design comprising a monoblock type encapsulation lasso;
Figure 1B is sealed to the xsect of a kind of conventional feedthrough seal design of the encapsulation lasso of (sealed to) packaging part for comprising;
Fig. 2 is a kind of xsect comprising the hermetic seal of high CTE encapsulation lasso;
Fig. 3 is the xsect of hermetic seal according to an embodiment of the invention;
Fig. 3 A is the xsect of hermetic seal according to an embodiment of the invention;
Fig. 4 is the xsect of hermetic seal according to an embodiment of the invention;
Fig. 5 is the xsect of hermetic seal according to an embodiment of the invention;
The partial sectional isometric views that Fig. 6 is the hermetic seal shown in Fig. 5;
Fig. 7 is a diagram without the feedthrough seal of compression sleeve.
Embodiment
Figure 1A and 1B is depicted as the hermetic seal of a kind of routine between optical fiber and the packaging part that optical device is housed.Optical fiber 50 is attached on packaging part 10 by optical fiber ferrule 20 and encapsulation lasso 30.By convention, packaging part 10 and encapsulation lasso are made up of low CTE material, and optical fiber ferrule is then made up of high CTE material.Exemplarily, packaging part 10 is made up of Kovar alloy (CTE is about 5.5ppm/C), and optical fiber ferrule 20 is made up of brass (CTE is about 20ppm/C), and encapsulation lasso 30 is made up of the material identical with packaging part 10.
Encapsulation lasso 30 shown in Figure 1A becomes one with packaging part 10, and the encapsulation lasso shown in Figure 1B 30 is welded on packaging part 10 in brazing/soldering mode, forms seam 70.Usually, encapsulation lasso 30 is made up of the material identical with packaging part 10, occurs heat-induced stress to avoid seam 70 place between the two.But, seam 60 between optical fiber ferrule 20 and encapsulation lasso 30 subjects significant tension: when the part of the optical fiber ferrule 20 adjacent with solder joint 60 is cooled to below welding temperature with the temperature of the part encapsulating lasso 30, encapsulation lasso 30, due to its lower CTE, will stop the contraction of the optical fiber ferrule 20 be made up of high CTE material.Tension " will tear " seam 60, cause it to degenerate.Due to the limited fatigue life of the solder that routine uses, be starved of the tension reducing seam crossing to greatest extent.
Encapsulation lasso 35 shown in Fig. 2 is made up of the high CTE material (as brass or aluminium) similar with optical fiber ferrule 20, makes the thermal stress at seam 65 place reach minimum.High CTE encapsulates lasso 35 and can be welded on low CTE packaging part 10 by brazing or soldering mode; Therefore, seam 75 place there will be high tension.So just there is problem, because need high temperature, because it will carry out before optical fiber ferrule and package cover lap welding connect to being encapsulated in operation level of seam between packaging part and encapsulation lasso.
With reference to Fig. 3, a kind of hermetic seal comprising the compression sleeve 100 be made up of high CTE material.Compression sleeve 100 encapsulates lasso 30 around low CTE and forms gas-tight seal.The CTE of compression sleeve 100, higher than the CTE of encapsulation lasso 30, to make seam 110 place between compression sleeve 100 and encapsulation lasso 30 form compressive stress, which thereby enhances sealing antifatigue reliability under thermal cycling.Because the high CTE material of compression sleeve 100 is at radial, the tangential and vertical low CTE material upwardly encapsulating lasso 30, in pressure seam 110, produce compressive stress.In the case owing to there is compressive stress state, the length of brazing/soldering seam 110 does not need long.
About the present invention, two parts gas-tight seals operation is together undertaken by brazing or soldering, specifically depends on the material that will seal.As a rule, they adopt the solder of relatively lower temp to carry out soldering, such as, use InSn at about 120 DEG C.The welding temperature of compression sleeve is low compared with the temperature of optical fiber solder, to avoid this seam at pressure seal weld period generation melt back.
Optical fiber ferrule 25 carries out gas-tight seal around optical fiber 50, and it is also sealed in compression sleeve 100 by the mode such as brazing or soldering simultaneously.Optical fiber ferrule 25 and compression sleeve 100 are made up of high CTE material; They can be made up of identical material, to eliminate stress between the two; Or they can be the integrated parts of monoblock type lasso 125 shown in Fig. 3 A.When optical fiber ferrule 25 and compression sleeve 100 adopt different materials to make, the CTE of compression sleeve is preferably not less than the CTE of optical fiber ferrule 25, to avoid in the tension of seam crossing generation between the two.When one less preferred, if the CTE of compression sleeve 100 is lower than the CTE of optical fiber ferrule 25, difference should within about 3ppm/C, to avoid occurring significant tension.
Low CTE encapsulates lasso 30 and can become one with packaging part 10, or is sealed to packaging part as shown in Figure 1A and 1B.Packaging part 10 and encapsulation lasso 30 are preferably heat coupling, and namely they have identical CTE, are always this situation when they are manufactured from the same material.
In the embodiment shown in fig. 3, optical fiber ferrule 25 is substantially identical with the external diameter of encapsulation lasso 30, usually in 1.5mm to 2.5mm scope; They correspond to the internal diameter of sleeve pipe 100, are solder joint 110 slot milling.The first paragraph length thereof of compression sleeve 100 carries out gas-tight seal around optical fiber ferrule 25, and the second length thereof of compression sleeve 100 carries out gas-tight seal around encapsulation lasso 30.
The length of optical fiber ferrule 25 changes usually in 10mm to 20mm scope, and encapsulation lasso 30 can stretch out about 6mm from packaging part wall.The wall thickness of optical fiber ferrule 25, encapsulation lasso 30 and sleeve pipe 100 depends on material used, can change in 0.5 to 1mm scope.
For the purpose of clearer and more definite, the term of " the high CTE " and " low CTE " that use in the application relates to the first and the second material, makes the CTE of the first material be greater than the CTE of the second material.The difference of CTE can be greater than 5ppm/C, and with mineralization pressure sealing, but difference is more preferably between 10-15ppm/C.
Packaging part 10 and encapsulation lasso 30 can by CTE lower than 10ppm/C, preferably lower than 8ppm/C, low CTE material make, such as section's watt (kovar) alloy and invar (invar) alloy.
The typical material of optical fiber ferrule 20 and 25 and sleeve pipe 100 and 200 (Fig. 4) has high CTE, namely higher than 13ppm/C, preferably higher than 20ppm/C; Material can comprise aluminium, copper and brass.
Between sleeve pipe 100 and encapsulation lasso 25 or the sleeve pipe 200 shown in Fig. 4 and the difference of CTE between encapsulation lasso 20 can be low to moderate 1ppm/C, produce tension to avoid seam crossing.Difference preferably higher than 5ppm/C, to produce significant compressive stress.In our practice, low CTE material is Kovar alloy and invar alloy, and high CTE material is aluminium and brass, and the difference of CTE is between 10 to 15ppm/C.Actual minimum CTE difference depends on the solder thickness between sleeve pipe and encapsulation lasso; Can infer, if solder thickness is very thin, as 5um, then CTE difference even can be less than 5ppm/C.
As shown in Figure 3, the method manufacturing the hermetic seal of optical fiber 50 in light module package part 10 comprises: provide the optical fiber 50 installed and be welded in optical fiber ferrule 25; For example, adopt BiSn solder, optical fiber ferrule 25 is made up of brass; By brazing or soldering mode, optical fiber ferrule 25 is welded in a part of compression sleeve 100; By brazing or soldering mode, another part of compression sleeve 100 is welded around encapsulation lasso 30.
Alternatively, compression sleeve 100 can first seal with encapsulation lasso 30, and then the inner optical fiber ferrule 25 having installed optical fiber 50 is inserted into sleeve pipe 100 and by brazing or soldering on sleeve pipe 100.
In another embodiment, hermetic seal adopts in Fig. 4 and is formed with the monoblock type lasso shown in grey.Described monoblock type lasso comprises and forms the optical fiber ferrule part 20 of gas-tight seal around optical fiber 50 and form the compression sleeve part 200 of gas-tight seal around encapsulation lasso 30.As described in above with reference to Fig. 3, the CTE of monoblock type lasso and even compression sleeve 200 is greater than the CTE of encapsulation lasso 30, with mineralization pressure seam 80.
Monoblock type lasso or at least its part have " U " shape xsect, and optical fiber ferrule 20 forms an arm of " U " shape, and compression sleeve 200 forms another arm of " U " shape; One end of encapsulation lasso 30 is inserted in the opening of " U " shape, as shown in Figure 4.Monoblock type lasso connecting fiber lasso 20 and compression sleeve 200, and cover outer (namely relative packaging part is far-end) edge that low CTE encapsulates lasso 30 and the sealing joints 85 between high CTE optical fiber ferrule 20, prevent the inner seam 85 by tension may be born of packaging part contaminated thus.
The material and other parameters that are applicable to design shown in Fig. 3 are also applicable to the embodiment shown in Fig. 4-7.Specifically, encapsulate lasso 30 can be sealed to packaging part 10 or become with it as a whole.
In one embodiment, optical fiber ferrule is made up of two or more parts be sealed: one with the interior section of optical fiber sealing-in, and one as shown in Figure 3 with compression sleeve sealing-in or as shown in Figure 4 with the exterior section of encapsulation lasso sealing-in.
The optical fiber ferrule 20 of optical fiber ferrule shown in replaceable Fig. 4 is constituted with reference to Fig. 5, inside race 20b and liner 20a.If inside race 20b and liner 20a is made up of different materials, then must be noted that to guarantee that the CTE of liner 20a is not less than the CTE of inside race 20b.Liner 20a and compression sleeve 200 as a whole.Monoblock type lasso is made up of inside race 20b, liner 20a and compression sleeve 200 in the case.
Figure 6 shows that the embodiment identical with Fig. 5.Liner 20a is designed to high CTE inside race (or pipe) 20b and low CTE and encapsulates adapter between lasso 30, forms gas-tight seal respectively with two solder joints being connected to inside race 20b and lasso 30.The thermal expansivity of liner 20a is selected as the thermal expansivity close to optical fiber tube 20b, reaches minimum to make the thermal stress at solder joint 210 place between inside race 20b and liner 20a.The CTE of liner 20a is not less than the CTE of optical fiber inside race 20b, forms tension to avoid seam 210 place between.
Liner 20a, compression sleeve 200 and low CTE encapsulate between lasso 30 comprise seam portion 80 shown in Fig. 4 and 85 the xsect of solder joint 220 be designed to " U " shape.Because the thermal expansion of liner 20a and compression sleeve 200 is higher than the thermal expansion of encapsulation lasso 30, in the sealing cooling procedure after solder joint 220 experiences hot forming, the contraction of liner 20a and compression sleeve 200 is faster than encapsulation lasso 30.Therefore, under the solder joint 220 on " U " shape outer arm will be in compressive stress.The anti-pollution mode of U-shaped inner arm is identical with above with reference to the mode described in seam portion in Fig. 4 85.
Embodiment shown in Fig. 7 does not have compression sleeve, therefore lacks the advantage of Fig. 3-6 illustrated embodiment.
With reference to Fig. 5 and 6, a kind of method manufacturing the hermetic seal of optical fiber 50 in optical module packaging part 10 comprises:
The optical fiber 50 installed and be welded in optical fiber tube 20b is provided; For example, adopt BiSn solder, optical fiber tube 20b is made up of brass;
By brazing or soldering mode, optical fiber tube 20b is welded in liner 20a;
Liner 20a is inserted in encapsulation lasso 30; Compression sleeve 200 is installed on the outside surface of encapsulation lasso 30 simultaneously; And
Be made up of compression sleeve and liner integral element brazing or soldering mode are welded on encapsulation lasso 30.
Alternatively, the integral element be made up of compression sleeve and liner can be welded on encapsulation lasso 30 and optical fiber tube 20b with brazing or soldering mode simultaneously.
Claims (9)
1. optical fiber to be arranged on the hermetic seal in optical module packaging part by one kind, comprise: to be attached on described packaging part in gas-tight seal mode or the encapsulation lasso that becomes one with described packaging part and monoblock type lasso, described monoblock type lasso comprises: the optical fiber ferrule carrying out gas-tight seal around described optical fiber, and carries out the compression sleeve of gas-tight seal around described encapsulation lasso; The thermal expansivity CTE of wherein said compression sleeve higher than the CTE of described encapsulation lasso, under making the seam between described compression sleeve and described encapsulation lasso be in compressive stress; With
The xsect of wherein said monoblock type lasso has " U " shape part, described optical fiber ferrule forms an arm of described " U " shape part be arranged between described optical fiber and described encapsulation lasso, described compression sleeve forms another arm of described " U " shape part, and one end of described encapsulation lasso is inserted in described " U " shape part.
2. hermetic seal as claimed in claim 1, wherein, the CTE of described compression sleeve is not less than the CTE of described optical fiber ferrule.
3. hermetic seal as claimed in claim 1, wherein, described compression sleeve and described optical fiber ferrule are integrated into an entirety.
4. hermetic seal as claimed in claim 1, wherein, described optical fiber ferrule comprises two parts sealed.
5. hermetic seal as claimed in claim 1, wherein, the CTE 1ppm/C at least higher than the CTE of described encapsulation lasso of described compression sleeve.
6. hermetic seal as claimed in claim 1, wherein, the CTE 5ppm/C at least higher than the CTE of described encapsulation lasso of described compression sleeve.
7. hermetic seal as claimed in claim 1, wherein, the material of described encapsulation lasso comprises Kovar alloy or invar alloy.
8. hermetic seal as claimed in claim 1, wherein, the material of described optical fiber ferrule comprises the one in aluminium, copper and brass.
9. hermetic seal as claimed in claim 1, wherein, the material of described compression sleeve comprises the one in aluminium, copper and brass.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US28897009P | 2009-12-22 | 2009-12-22 | |
| US61/288,970 | 2009-12-22 | ||
| US12/750,084 | 2010-03-30 | ||
| US12/750,084 US8342756B2 (en) | 2009-12-22 | 2010-03-30 | Hermetic seal between a package and an optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102103237A CN102103237A (en) | 2011-06-22 |
| CN102103237B true CN102103237B (en) | 2015-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010586977.8A Active CN102103237B (en) | 2009-12-22 | 2010-12-14 | Hermetic seal between packaging part and optical fiber |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US8342756B2 (en) |
| EP (1) | EP2339385B1 (en) |
| CN (1) | CN102103237B (en) |
Families Citing this family (10)
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| US20160274318A1 (en) | 2012-03-05 | 2016-09-22 | Nanoprecision Products, Inc. | Optical bench subassembly having integrated photonic device |
| CN106842440A (en) * | 2012-03-05 | 2017-06-13 | 纳米精密产品股份有限公司 | The coupling device with structured reflecting surface for coupling optical fiber input/output |
| US9213148B2 (en) | 2012-04-11 | 2015-12-15 | Nanoprecision Products, Inc. | Hermetic optical fiber alignment assembly |
| US9500808B2 (en) | 2012-05-09 | 2016-11-22 | The Boeing Company | Ruggedized photonic crystal sensor packaging |
| US9656439B2 (en) | 2013-07-10 | 2017-05-23 | Lumentum Operations Llc | Assembly of components having different coefficients of thermal expansion |
| JP6226782B2 (en) * | 2014-03-13 | 2017-11-08 | オリンパス株式会社 | Optical transmission module and optical transmission module manufacturing method |
| JP6935206B2 (en) | 2017-02-14 | 2021-09-15 | 古河電気工業株式会社 | Optical element package and optical element module |
| US10481344B2 (en) * | 2017-11-21 | 2019-11-19 | Lumentum Operations Llc | High density optical fiber feedthrough |
| JP6995384B2 (en) * | 2019-08-22 | 2022-01-14 | 湖北工業株式会社 | Fiber optic feedthrough |
| CN112993745B (en) * | 2019-12-13 | 2022-06-10 | 潍坊华光光电子有限公司 | Pin structure for improving TO packaging airtightness and sintering method |
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| US5177806A (en) | 1986-12-05 | 1993-01-05 | E. I. Du Pont De Nemours And Company | Optical fiber feedthrough |
| GB2228340B (en) | 1989-02-16 | 1993-02-10 | Stc Plc | Hermetic gland for optical fibres |
| US5386488A (en) | 1992-04-02 | 1995-01-31 | Fujitsu Limited | Optical module and manufacturing method therefor |
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| JP2945246B2 (en) | 1993-06-23 | 1999-09-06 | 株式会社日立製作所 | Optical element module |
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| US5970194A (en) | 1998-02-19 | 1999-10-19 | Uniphase Telecommunications Products, Inc. | Optical fiber having hermetically sealable section |
| US6837075B1 (en) | 2000-10-27 | 2005-01-04 | Bookham Technology, Plc. | Glass fiber fixative and fixing process |
| US6633720B1 (en) | 2001-03-30 | 2003-10-14 | Avanex Corporation | Hermetic seal feed-through assembly for optical fiber |
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| US20030190135A1 (en) * | 2002-04-03 | 2003-10-09 | Moidu Abdul Jaleel J. | Hermetic waveguide seals and method of making them |
| CA2404093C (en) | 2002-09-18 | 2009-02-24 | Itf Technologies Optiques Inc.- Itf Optical Technologies Inc. | Optical component packaging device |
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2010
- 2010-03-30 US US12/750,084 patent/US8342756B2/en active Active
- 2010-11-19 EP EP10191951.2A patent/EP2339385B1/en active Active
- 2010-12-14 CN CN201010586977.8A patent/CN102103237B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN102103237A (en) | 2011-06-22 |
| US8342756B2 (en) | 2013-01-01 |
| US20110170833A1 (en) | 2011-07-14 |
| EP2339385A1 (en) | 2011-06-29 |
| EP2339385B1 (en) | 2014-12-03 |
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Effective date of registration: 20151104 Address after: American California Patentee after: JDS UNIPHASE CORPORATION Address before: No. 430 California 95035 Milpitas Boulevard Mccarthy Patentee before: Flex Products Inc. A. JDS Unipha |